The drive system uses a permanent magnet synchronous gearless traction machine. Compared with the traditional worm gear and worm drive traction machine, the permanent magnet synchronous gearless traction machine has the following advantages:
1. The permanent magnet synchronous gearless traction machine is directly driven. There is no worm gear or worm drive pair. The permanent magnet synchronous motor does not have the stator coil that takes up a lot of space for the asynchronous motor. The main material for the permanent magnet synchronous motor is high energy. The density of high remanence and high coercivity of neodymium iron boron generally has an air gap magnetic density of more than 0.75T, so it can be small in size and light in weight.
2. The traction machine has high transmission efficiency. Due to the direct drive of permanent magnet synchronous motor (without worm gear transmission pair), the transmission efficiency can be increased by 20% to 30%.
3. Permanent magnet synchronous gearless traction machine. Because there is no noise generated by the bearing when an asynchronous motor is running at high speed and there is no noise generated by the contact transmission of the worm gear and worm pair, the noise of the whole machine can be reduced by 5～10db(A) .
4. Low energy consumption. From the working principle of the permanent magnet synchronous motor, it can be known that the excitation is realized by the permanent magnet, and the stator does not need to provide additional excitation current, so the power factor of the motor can reach very high (in theory, it can reach 1). At the same time, there is no current through the rotor of the permanent magnet synchronous motor, and there is no problem of rotor loss. Generally, the loss of 45%～60% is lower than that of asynchronous motors. Since there is no low-efficiency and high-energy-consumption worm gear drive pair, energy consumption is further reduced.
5. Permanent magnet synchronous gearless traction machine does not have the problem of tooth profile wear and does not need to replace the lubricating oil regularly, so it has a long service life and basically does not require maintenance. In the near future, if the cost problem of producing permanent magnet synchronous motors can be solved as soon as possible, permanent magnet synchronous gearless traction machines will replace the traction machines composed of worm gears and asynchronous motors. Of course, superconducting force drag technology and magnetic levitation drive technology will also be applied to elevators in the future. 1. Energy-saving and dynamic performance of the drive system: the use of multi-pole low-speed direct drive permanent magnet synchronous traction machine, without the need for a huge mechanical transmission efficiency of only about 70% of the worm gear, worm reduction gear box; compared with induction motors, no need Reactive current is drawn from the grid, so the power factor is high; because there is no excitation winding and no excitation loss, the heat is small, so there is no need for fans, no wind and friction, and high efficiency; using field-oriented vector conversion control, it has the same excellent rotation as a DC motor. With torque control characteristics, the starting and braking current is significantly lower than that of induction motors, and the required motor power and inverter capacity have been reduced. 2. Stable and low noise: low-speed direct drive, so the bearing noise is low, no fan, no worm gear noise. The noise can generally be lowered by 5 to 10 decibels, reducing environmental noise pollution. 3. Save space: no large reduction gearbox, no excitation winding, high-performance neodymium iron boron permanent magnet material, so the motor is small in size and light in weight, which can reduce the machine room or eliminate the need for a machine room
